Multiple Choice Identify the choice that best completes the statement or answers the question. |
| 1. | Planarians can reproduce asexually by a. | fission. | c. | producing polyps. | b. | forming larvae. | d. | exchanging both sperm and eggs. |
|
| 2. | Which of the following is not found in flatworms? a. | an anterior end | c. | bilateral symmetry | b. | a circulatory system | d. | a nervous system |
|
| 3. | Flatworms have no need for circulatory and respiratory systems because a. | the digestive system performs these functions. | b. | their cells are close to the animal’s exterior surface. | c. | the spherical body shape allows diffusion of materials into tissues. | d. | the coelom is bathed in blood and oxygen. |
|
| 4. | Schistosomiasis is a disease caused by a a. | roundworm. | c. | cestode. | b. | trematode. | d. | planarian. |
|
| 5. | turbellarians : free-living :: a. | planaria : parasitic | c. | cestodes : free-living | b. | tapeworms : free-living | d. | flukes : parasitic |
|
| 6. | Which of the following statements about tapeworms is false? a. | They can infect a person who eats undercooked food. | b. | They belong to the genus Schistosoma. | c. | They can grow to be large in human intestines. | d. | They do not have a digestive system. |
|
| 7. | To which phylum do roundworms belong? a. | Annelida | c. | Platyhelminthes | b. | Nematoda | d. | Arthropoda |
|
| 8. | Roundworms have a fluid-filled cavity called a a. | coelom. | c. | digestive system. | b. | pseudocoelom. | d. | None of the above |
|
| 9. | Roundworms have a digestive tract with ____ opening(s). |
| 10. | All of the following groups of invertebrates are coelomates except a. | annelids. | c. | mollusks. | b. | echinoderms. | d. | nematodes. |
|
| 11. | A roundworm’s digestive tract can be considered an advancement over a gastrovascular cavity because a. | food moves through it in only one direction. | b. | different parts of the tract can carry out different functions. | c. | undigested wastes do not have to leave through the same opening where food is taken in. | d. | All of the above |
|
| 12. | The nematode Ascaris lumbricoides infects humans, spending most of its adult life inside the intestines of its host. To be infected, a person must a. | consume the nematode’s eggs. | b. | walk barefoot on infested soil. | c. | sit on an infested toilet seat. | d. | All of the above |
|
| 13. | A type of roundworm that lives a parasitic life is a. | Ascaris. | c. | Trichinella. | b. | Enterobius. | d. | All of the above |
|
| 14. | A rotifer uses ____ to collect excess water in order to remove the water from the body. a. | diffusion | b. | kidneys | c. | flame cells and excretory tubules | d. | a mastax |
|
| 15. | Which of the following statements is not true? a. | Most tapeworms are hermaphrodites. | b. | Planarians reproduce both sexually and asexually. | c. | Some rotifers reproduce by parthenogenesis. | d. | Because they are all parasitic, roundworms reproduce asexually. |
|
| 16. | Tapeworms absorb food from the host through their a. | scolex. | c. | suckers. | b. | tegument. | d. | None of the above |
|
| 17. | Humans can avoid trichinosis by a. | avoiding undercooked meat. | b. | avoiding public restrooms. | c. | wearing shoes outdoors. | d. | washing their hands frequently. |
|
| 18. | Which of the following has a cloaca? a. | a fluke | c. | a rotifer | b. | a nematode | d. | a tapeworm |
|
| 19. | Parasitic flatworms a. | probably evolved from free-living organisms. | b. | gave rise to free-living flatworms. | c. | have a gut with two openings. | d. | are found mostly in the class Turbellaria. |
|
| 20. | Which of the following is not true about the planarian nervous system? a. | It includes a ladderlike arrangement of nerves. | b. | It provides the ability to sense light intensity. | c. | It includes one ventral nerve cord. | d. | It provides the ability to learn. |
|
Completion Complete each statement. |
| 21. | A schistosome is a member of the phylum ____________________. |
| 22. | The ability of some animals, such as flatworms, to regrow lost parts of their bodies is called ____________________. |
| 23. | Flatworms take up oxygen and release carbon dioxide by the process of ____________________, which occurs across the body surface of the animals. |
| 24. | The ____________________ is a protective cellular covering of the bodies of endoparasitic flukes that prevents them from being digested by their hosts. |
| 25. | ____________________ are rectangular body sections of tapeworms. |
| 26. | Roundworms are members of the phylum ____________________. |
| 27. | Roundworms take in food through the mouth and eliminate wastes through an opening at the other end of the digestive tract called the ____________________. |
| 28. | Organisms that feed by using cilia to sweep food into their mouths are called ____________________. |
| 29. | ____________________ are the simplest animals with bilateral symmetry. |
| 30. | Concentration of sense organs at the anterior end can be observed in flatworms and is called ____________________. |
| 31. | A planarian takes in food through the ____________________. |
| 32. | The ____________________ is a noncellular layer that protects a roundworm. |
| 33. | Being infected with ____________________ worms can cause a condition known as elephantiasis. |
Essay |
| 34. | A planarian cannot eat when food is already in its gut. Why? Write your answer in the space below. |